Sodium tanshinone IIA sulfonate (STS) is a water-soluble derivative of tanshinone IIA isolated as the main pharmacologically active natural compound from a traditional Chinese herbal medicine, the dried root of Salvia miltiorrhiza Bunge known as Danshen. Sodium tanshinone IIA sulfonate (STS) is a potent negative allosteric modulator of the human purinergic receptor P2X7. Sodium tanshinone IIA sulfonate (STS) inhibits the activity of CYP3A4 and store-operated Ca2+ entry (SOCE) through store-operated Ca2+ channels (SOCC) via downregulating the expression of transient receptor potential canonical proteins (TRPC).